condition mean min max ZT0-3 3858.999941 3858.999941 3858.999941 ZT4-7 2974.0984904999996 2974.0984904999996 2974.0984904999996 ZT8-11 2187.7914115000003 2187.7914115000003 2187.7914115000003 ZT12-15 2393.6026145 2393.6026145 2393.6026145 ZT16-19 2693.6183175 2693.6183175 2693.6183175 ZT20-23 3530.0115305 3530.0115305 3530.0115305